Drying apparatus



Feb. 11, 1930. Y A. KOLITSCH 1 DRYING APPARATUS Filed Jan. 12, 1929 l/vvf/vran, fluausr KaL/rscH.

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' ewherehy'the operation can be adjusted to Y 45 drawingsin whichz- UNITED STA ES p myomcn Leaner mm, or rear ALFRED, QUEBEC; CANADA name nrrnnarus Application filed Ianuary'12, 1929, Serial No. 332,170, andinflanada larch 19, 1928.

This invention relates to paper making and more particularly to improvements .in thedrying apparatus.

The removal of the water content of the webof paper after it leaves the wire on which it is formed, is usually carried out by passing it between a series of press rolls and then a series of heated dryer rolls. The'greater proportion that can be removed in the press 7 10 rolls the greater the economy of steam in t the dryer rolls and therefore a cheaper;

product.

This invention has for its object. to.increase the efliciency of the press'rolls and the felts which carry the web of paper through them, and to decrease the number of dryer rolls requiredto complete the drying operai I When-the Web of newly formed paper is 2 carried by a felt to the first ress roll it'contains. a large *proportion 0 water. When they arrive at the nipwhere the pressure between the upper and lower rolls squeezes some of the watenout of the web of paper,

this water forms a continuous layer across the felt as it passes between the rolls. As this layer of water cannot "pass between the rolls and as it is being increased'in quantity continuously, its removal will greatly assist the, operation .of the press roll and the dryness of the felt. w

The means I employ to remove a "large amount of this layer ofwater consists of a series of high pressure air jets from a mani- 5 fold connected with a pressure pump These jets are so directed that they blow 1 the layer ofwater away to either side of the roll. A-suitable hood at-eachiside receives the sprayiand conducts itto' the pit below. The ets areprovided'with control valves .various conditions in the manufacture of pa er of different conditions.

' Fig. 1. shows a side vie 'w with apparatus in position.

" i Fig. 2'. shows a plan viewwith felt removed.

Fig. 3. shows side view of hood. Fig. 4.- shows end view of hood.

- and water and conduct it to suitable recepeference" is made to the accompanying,

of a press roll side.

, The-pressroll 3, journalled on the bearings 30, has the upper r0114; mounted above it, and the felt 2, carrying the web of paper 1, passes between the rolls 3, and '4, which are adjusted toexert a high pressure on the moisture ladened webl. The water is squeezed out of the web and throu h the felt and forms a layer'k', across the sur ace of the roll 3.

A manifold 5, with a series of jets 51, extends across the machine parallel to the roll 3, with thejets 51, arranged to blow the layer of water'7,-formed in the nip, transversely from the center outwards, when high pressure air is -supplied to the manifold 5. The jets 51, directed to either side transverselyjof the webare rovided with control valves 52, wherebyt e amount of air can be ad justed to the particular requirements of the "paper being manufactured.

In order to trap the spray formed when the jets 51, are blowing the water of the layer 7, to the sides of the roll, hoodsv 6, are provided with funnels 61, which receive the spray tacles. 1. y While I have shown one form of apparatus to remove theilayer of water in the nip of a press roll, I do not restrict my patent to the particular means disclosed, but to the removal of this layer of water b air pressure. By the rapid removal of the ayer of water at the nip of the felt and the press rolls the speed of the water removal isthereby accelcreasedwhile the felts are maintained in erated and the efficiency of the rolls isineatly improved condition. The latter gature is-evident as. the water at the ni containing stock' material on being imme 'ately removed, prevents the clogging of the felt by thatmaterial. The lower side of the felt is.

maintained in a higher state ofefliciency by r its increased porosity and the. life. of the felt is therefore increased.

What I claim is 1. In a papermachine the combination of press rolls, and a felt adapted to carry. a' web of paper-between the rolls withmeans to remove the water squeezed into the nip vof the rolls from the paper, transverselyto either of aper between the rol 2. In a paper machine the combination of press rolls, and a felt adapted to carry a web with a series of hig pressure air' jets adapted to remove the 5 water squeezed into the nip of the rolls from the paper, transversely to either side.

3. In a paper machlne the combination of press rolls, and a felt ada ted to carry a web of (paper between the rol s, with a manifold an a series of high pressure transverse air jets adapted to remove the water squeezed into the nip of the rolls from the paper.

4. In a paper machine the combination of press rolls, and a felt adapted to carry a web 15 of (paper between the rolls, with a manifold an a series of high pressure transverse air jets with controlvalves, adapted to remove the water squeezed into the nip of the rolls from the paper. I I 20 5. Ina paper machine the combination of press rolls, and a felt adapted to carry, a web of paper between the rolls, with means to remove the water squeezed into the'nip of the rolls from the paper transversely to either 25 side, and hoods to receive the spray.

. 6. The combination of a pair of press rolls, adapted to com ress a moisture ladened web, with a series. 0 outwardly directed air jets adjacent the nip of the rolls to transversely 86 remove the water squeezed into the nip of the rolls. AUGUST KOLITSCH. 

